457 lines
11 KiB
C#
457 lines
11 KiB
C#
using System;
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using System.IO;
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using System.Runtime.InteropServices;
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using RefreshCS;
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namespace MoonWorks.Graphics
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{
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public static class ImageUtils
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{
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/// <summary>
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/// Gets pointer to pixel data from compressed image byte data.
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///
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/// The returned pointer must be freed by calling FreePixelData.
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/// </summary>
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public static unsafe IntPtr GetPixelDataFromBytes(
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Span<byte> data,
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out uint width,
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out uint height,
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out uint sizeInBytes
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) {
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fixed (byte* ptr = data)
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{
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var pixelData =
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Refresh.Refresh_Image_Load(
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(nint) ptr,
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data.Length,
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out var w,
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out var h,
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out var len
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);
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width = (uint) w;
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height = (uint) h;
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sizeInBytes = (uint) len;
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return pixelData;
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}
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}
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/// <summary>
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/// Gets pointer to pixel data from a compressed image stream.
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///
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/// The returned pointer must be freed by calling FreePixelData.
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/// </summary>
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public static unsafe IntPtr GetPixelDataFromStream(
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Stream stream,
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out uint width,
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out uint height,
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out uint sizeInBytes
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) {
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var length = stream.Length;
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var buffer = NativeMemory.Alloc((nuint) length);
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var span = new Span<byte>(buffer, (int) length);
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stream.ReadExactly(span);
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var pixelData = GetPixelDataFromBytes(span, out width, out height, out sizeInBytes);
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NativeMemory.Free(buffer);
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return pixelData;
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}
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/// <summary>
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/// Gets pointer to pixel data from a compressed image file.
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///
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/// The returned pointer must be freed by calling FreePixelData.
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/// </summary>
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public static IntPtr GetPixelDataFromFile(
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string path,
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out uint width,
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out uint height,
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out uint sizeInBytes
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) {
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var fileStream = new FileStream(path, FileMode.Open, FileAccess.Read);
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return GetPixelDataFromStream(fileStream, out width, out height, out sizeInBytes);
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}
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/// <summary>
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/// Get metadata from compressed image bytes.
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/// </summary>
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public static unsafe bool ImageInfoFromBytes(
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Span<byte> data,
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out uint width,
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out uint height,
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out uint sizeInBytes
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) {
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fixed (byte* ptr = data)
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{
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var result =
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Refresh.Refresh_Image_Info(
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(nint) ptr,
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data.Length,
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out var w,
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out var h,
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out var len
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);
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width = (uint) w;
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height = (uint) h;
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sizeInBytes = (uint) len;
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return Conversions.ByteToBool(result);
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}
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}
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/// <summary>
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/// Get metadata from a compressed image stream.
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/// </summary>
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public static unsafe bool ImageInfoFromStream(
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Stream stream,
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out uint width,
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out uint height,
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out uint sizeInBytes
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) {
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var length = stream.Length;
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var buffer = NativeMemory.Alloc((nuint) length);
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var span = new Span<byte>(buffer, (int) length);
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stream.ReadExactly(span);
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var result = ImageInfoFromBytes(span, out width, out height, out sizeInBytes);
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NativeMemory.Free(buffer);
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return result;
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}
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/// <summary>
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/// Get metadata from a compressed image file.
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/// </summary>
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public static bool ImageInfoFromFile(
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string path,
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out uint width,
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out uint height,
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out uint sizeInBytes
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) {
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var fileStream = new FileStream(path, FileMode.Open, FileAccess.Read);
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return ImageInfoFromStream(fileStream, out width, out height, out sizeInBytes);
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}
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/// <summary>
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/// Frees pixel data obtained from GetPixelData methods.
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/// </summary>
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public static void FreePixelData(IntPtr pixels)
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{
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Refresh.Refresh_Image_Free(pixels);
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}
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/// <summary>
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/// Saves pixel data contained in a TransferBuffer to a PNG file.
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/// </summary>
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public static unsafe void SavePNG(
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string path,
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TransferBuffer transferBuffer,
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uint bufferOffsetInBytes,
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int width,
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int height,
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bool bgra
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) {
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var sizeInBytes = width * height * 4;
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var pixelsPtr = NativeMemory.Alloc((nuint) sizeInBytes);
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var pixelsSpan = new Span<byte>(pixelsPtr, sizeInBytes);
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transferBuffer.GetData(pixelsSpan, bufferOffsetInBytes);
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if (bgra)
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{
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// if data is bgra, we have to swap the R and B channels
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var rgbaPtr = NativeMemory.Alloc((nuint) sizeInBytes);
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var rgbaSpan = new Span<byte>(rgbaPtr, sizeInBytes);
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for (var i = 0; i < sizeInBytes; i += 4)
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{
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rgbaSpan[i] = pixelsSpan[i + 2];
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rgbaSpan[i + 1] = pixelsSpan[i + 1];
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rgbaSpan[i + 2] = pixelsSpan[i];
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rgbaSpan[i + 3] = pixelsSpan[i + 3];
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}
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NativeMemory.Free(pixelsPtr);
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pixelsPtr = rgbaPtr;
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}
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Refresh.Refresh_Image_SavePNG(path, (nint) pixelsPtr, width, height);
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NativeMemory.Free(pixelsPtr);
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}
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// DDS loading extension, based on MojoDDS
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// Taken from https://github.com/FNA-XNA/FNA/blob/1e49f868f595f62bc6385db45949a03186a7cd7f/src/Graphics/Texture.cs#L194
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public static void ParseDDS(
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BinaryReader reader,
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out TextureFormat format,
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out int width,
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out int height,
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out int levels,
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out bool isCube
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) {
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// A whole bunch of magic numbers, yay DDS!
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const uint DDS_MAGIC = 0x20534444;
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const uint DDS_HEADERSIZE = 124;
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const uint DDS_PIXFMTSIZE = 32;
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const uint DDSD_HEIGHT = 0x2;
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const uint DDSD_WIDTH = 0x4;
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const uint DDSD_PITCH = 0x8;
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const uint DDSD_LINEARSIZE = 0x80000;
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const uint DDSD_REQ = (
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DDSD_HEIGHT | DDSD_WIDTH
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);
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const uint DDSCAPS_MIPMAP = 0x400000;
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const uint DDSCAPS_TEXTURE = 0x1000;
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const uint DDSCAPS2_CUBEMAP = 0x200;
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const uint DDPF_FOURCC = 0x4;
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const uint DDPF_RGB = 0x40;
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const uint FOURCC_DXT1 = 0x31545844;
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const uint FOURCC_DXT3 = 0x33545844;
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const uint FOURCC_DXT5 = 0x35545844;
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const uint FOURCC_DX10 = 0x30315844;
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const uint pitchAndLinear = (
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DDSD_PITCH | DDSD_LINEARSIZE
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);
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// File should start with 'DDS '
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if (reader.ReadUInt32() != DDS_MAGIC)
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{
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throw new NotSupportedException("Not a DDS!");
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}
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// Texture info
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uint size = reader.ReadUInt32();
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if (size != DDS_HEADERSIZE)
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{
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throw new NotSupportedException("Invalid DDS header!");
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}
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uint flags = reader.ReadUInt32();
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if ((flags & DDSD_REQ) != DDSD_REQ)
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{
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throw new NotSupportedException("Invalid DDS flags!");
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}
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if ((flags & pitchAndLinear) == pitchAndLinear)
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{
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throw new NotSupportedException("Invalid DDS flags!");
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}
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height = reader.ReadInt32();
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width = reader.ReadInt32();
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reader.ReadUInt32(); // dwPitchOrLinearSize, unused
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reader.ReadUInt32(); // dwDepth, unused
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levels = reader.ReadInt32();
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// "Reserved"
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reader.ReadBytes(4 * 11);
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// Format info
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uint formatSize = reader.ReadUInt32();
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if (formatSize != DDS_PIXFMTSIZE)
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{
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throw new NotSupportedException("Bogus PIXFMTSIZE!");
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}
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uint formatFlags = reader.ReadUInt32();
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uint formatFourCC = reader.ReadUInt32();
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uint formatRGBBitCount = reader.ReadUInt32();
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uint formatRBitMask = reader.ReadUInt32();
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uint formatGBitMask = reader.ReadUInt32();
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uint formatBBitMask = reader.ReadUInt32();
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uint formatABitMask = reader.ReadUInt32();
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// dwCaps "stuff"
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uint caps = reader.ReadUInt32();
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if ((caps & DDSCAPS_TEXTURE) == 0)
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{
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throw new NotSupportedException("Not a texture!");
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}
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isCube = false;
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uint caps2 = reader.ReadUInt32();
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if (caps2 != 0)
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{
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if ((caps2 & DDSCAPS2_CUBEMAP) == DDSCAPS2_CUBEMAP)
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{
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isCube = true;
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}
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else
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{
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throw new NotSupportedException("Invalid caps2!");
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}
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}
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reader.ReadUInt32(); // dwCaps3, unused
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reader.ReadUInt32(); // dwCaps4, unused
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// "Reserved"
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reader.ReadUInt32();
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// Mipmap sanity check
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if ((caps & DDSCAPS_MIPMAP) != DDSCAPS_MIPMAP)
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{
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levels = 1;
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}
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// Determine texture format
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if ((formatFlags & DDPF_FOURCC) == DDPF_FOURCC)
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{
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switch (formatFourCC)
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{
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case 0x71: // D3DFMT_A16B16G16R16F
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format = TextureFormat.R16G16B16A16_SFLOAT;
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break;
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case 0x74: // D3DFMT_A32B32G32R32F
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format = TextureFormat.R32G32B32A32_SFLOAT;
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break;
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case FOURCC_DXT1:
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format = TextureFormat.BC1;
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break;
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case FOURCC_DXT3:
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format = TextureFormat.BC2;
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break;
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case FOURCC_DXT5:
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format = TextureFormat.BC3;
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break;
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case FOURCC_DX10:
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// If the fourCC is DX10, there is an extra header with additional format information.
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uint dxgiFormat = reader.ReadUInt32();
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// These values are taken from the DXGI_FORMAT enum.
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switch (dxgiFormat)
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{
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case 2:
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format = TextureFormat.R32G32B32A32_SFLOAT;
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break;
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case 10:
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format = TextureFormat.R16G16B16A16_SFLOAT;
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break;
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case 71:
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format = TextureFormat.BC1;
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break;
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case 74:
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format = TextureFormat.BC2;
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break;
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case 77:
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format = TextureFormat.BC3;
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break;
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case 98:
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format = TextureFormat.BC7;
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break;
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default:
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throw new NotSupportedException(
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"Unsupported DDS texture format"
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);
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}
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uint resourceDimension = reader.ReadUInt32();
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// These values are taken from the D3D10_RESOURCE_DIMENSION enum.
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switch (resourceDimension)
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{
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case 0: // Unknown
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case 1: // Buffer
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throw new NotSupportedException(
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"Unsupported DDS texture format"
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);
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default:
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break;
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}
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/*
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* This flag seemingly only indicates if the texture is a cube map.
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* This is already determined above. Cool!
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*/
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uint miscFlag = reader.ReadUInt32();
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/*
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* Indicates the number of elements in the texture array.
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* We don't support texture arrays so just throw if it's greater than 1.
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*/
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uint arraySize = reader.ReadUInt32();
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if (arraySize > 1)
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{
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throw new NotSupportedException(
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"Unsupported DDS texture format"
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);
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}
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reader.ReadUInt32(); // reserved
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break;
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default:
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throw new NotSupportedException(
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"Unsupported DDS texture format"
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);
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}
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}
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else if ((formatFlags & DDPF_RGB) == DDPF_RGB)
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{
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if ( formatRGBBitCount != 32 ||
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formatRBitMask != 0x00FF0000 ||
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formatGBitMask != 0x0000FF00 ||
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formatBBitMask != 0x000000FF ||
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formatABitMask != 0xFF000000 )
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{
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throw new NotSupportedException(
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"Unsupported DDS texture format"
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);
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}
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format = TextureFormat.B8G8R8A8;
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}
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else
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{
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throw new NotSupportedException(
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"Unsupported DDS texture format"
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);
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}
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}
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public static int CalculateDDSLevelSize(
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int width,
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int height,
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TextureFormat format
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) {
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if (format == TextureFormat.R8G8B8A8)
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{
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return (((width * 32) + 7) / 8) * height;
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}
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else if (format == TextureFormat.R16G16B16A16_SFLOAT)
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{
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return (((width * 64) + 7) / 8) * height;
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}
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else if (format == TextureFormat.R32G32B32A32_SFLOAT)
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{
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return (((width * 128) + 7) / 8) * height;
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}
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else
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{
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int blockSize = 16;
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if (format == TextureFormat.BC1)
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{
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blockSize = 8;
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}
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width = System.Math.Max(width, 1);
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height = System.Math.Max(height, 1);
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return (
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((width + 3) / 4) *
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((height + 3) / 4) *
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blockSize
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);
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}
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}
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}
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}
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